Du Zhiguo, Guo Yu, Wang Haiyang, Gu Jianan, Zhang Yongzheng, Cheng Zongju, Li Bin, Li Songmei, Yang Shubin
Key Laboratory of Aerospace Advanced Materials and Performance of Ministry of Education, School of Materials Science and Engineering, Beihang University, 100191 Beijing, China.
ACS Nano. 2021 Dec 28;15(12):19275-19283. doi: 10.1021/acsnano.1c05268. Epub 2021 Dec 13.
Although transition metal dichalcogenides (TMDs) monolayers are widely applied in electronics, optics, catalysis, and energy storage, their yield or output is commonly very low (<1 wt % or micrometer level) based on the well-known top-down (, exfoliation) and bottom-up (, chemical vapor deposition) approaches. Here, 1T MoS monolayers with a very high fraction of ∼90% were achieved the conversion of Mo-based MXenes (MoCT and MoCT) at high temperatures in hydrogen sulfide gas, in which the Mo-layer of Mo-based MXenes could be transformed to MoS monolayers and the Mo vacancies facilitate the gliding of sulfur layers to form 1T MoS. The resultant 1T MoS monolayers with numerous vacancies exhibit strong chemisorption and high catalytic activity for lithium polysulfides (LiPSs), delivering a reversible capacity of 736 mAh g at 0.5 C, a superior rate capability of 532 mAh g at 5 C, and a good stability up to 200 cycles at 1 C in lithium-sulfur (Li-S) batteries.
